PITTSBURGH — Police ordered protesters to disperse at the Group of
20 summit last week with a device that can beam earsplitting alarm
tones and verbal instructions that the manufacturer likens to a
"spotlight of sound," but that legal groups called potentially
The device, called a Long Range Acoustic Device,
concentrates voice commands and a car alarm-like sound in a 30- or
60-degree cone that can be heard nearly two miles away. It is about two
feet square and mounted on a swivel such that one person can point it
where it's needed. The volume measures 140-150 decibels three feet away
— louder than a jet engine — but dissipates with distance.
Putnam, spokesman for the manufacturer, San Diego-based American
Technology Corp., said it's "like a big spotlight of sound that you can
shine on people."
"It's not a sonic cannon. It's not the death
ray or anything like that," Putnam said. "It's about long-range
communications being heard intelligibly."
During the Pittsburgh
protests, police used the device to order demonstrators to disperse and
to play a high-pitched "deterrent tone" designed to drive people away.
It was the first time the device was used in a riot-control situation
on U.S. soil, according to American Technology and police.
who heard it said authorities' voice commands were clear and sounded as
if they were coming from everywhere all at once. They described the
"deterrent tone" as unbearable.
Joel Kupferman, who was at
Thursday's march as a legal observer for the National Lawyer's Guild,
said he was overwhelmed by the tone and called it "overkill."
"When people were moving and they still continued to use it, it was an excessive use of weaponry," Kupferman said.
"Vic" Walczak, legal director for the American Civil Liberties Union in
Pennsylvania, said the device is a military weapon capable of producing
permanent hearing loss, something he called "an invitation to an
The operator of the device is usually behind it and not in the path of the focused beam of sound.
Palmer, director of audiology at the University of Pittsburgh Medical
Center, said 140 decibels can cause immediate hearing loss. But there's
no way to know if anyone was exposed to sounds that loud without
knowing how far away they were, she said.
Putnam and public safety officials said the complaints prove the device worked as designed.
have to put your hands over your ears and cover them, and it's
difficult to throw stuff," said Ray DeMichiei, deputy director of the
city's emergency management agency.
Police said they used the
device last Thursday to issue prerecorded warnings to disperse when
hundreds of demonstrators, including self-described anarchists, without
a protest permit held a march that threatened to turn violent.
of concerns about the volume, police were careful to use it about 12
feet off the ground mounted on a tactical vehicle, so no individual
would be directly in its path or too close to it, Assistant Chief
William Bochter said.
"The only way anybody gets hurt is if the deterrent is on full blast and they stand directly in front of it," Putnam said.
regional counterterror task force bought four of the devices from
American Technology using $101,000 in federal Homeland Security funds,
DeMichiei said. Because the amplified message was prerecorded, police
could be sure the protesters heard exactly the instructions police
desired and have confidence those in the back of the crowd could hear,
Such devices also have military and commercial
applications. Putnam said the primary purpose is to transmit specific
orders loudly and clearly.
They have been used against protesters
overseas, and police in New York threatened to use one during
demonstrations near the Republican National Convention in 2004.
said the city of San Diego uses them to instruct people to leave large
sections of beach after festivals. It has also been used in SWAT
In military applications, it allows ships to hail
approaching vessels and determine their intent, the company says. Cargo
ships use them to tell pirates that they had been spotted. When the
pirates know they have lost the element of surprise, they will not
attack, Putnam said.
Putnam said those complaining about the
device have probably exposed themselves to sounds nearly as loud at
rock concerts, and for longer periods of time. Walczak, the ACLU
attorney, isn't buying the analogy.
"People don't flee the front
row of a rock concert. Why would they be fleeing here?" Walczak asked.
"Because it's loud, it's painfully loud."